2 * Copyright 2011-2013 Freescale Semiconductor, Inc.
3 * Copyright 2011 Linaro Ltd.
5 * The code contained herein is licensed under the GNU General Public
6 * License. You may obtain a copy of the GNU General Public License
7 * Version 2 or later at the following locations:
9 * http://www.opensource.org/licenses/gpl-license.html
10 * http://www.gnu.org/copyleft/gpl.html
13 #include <linux/clk.h>
14 #include <linux/clk-provider.h>
15 #include <linux/clkdev.h>
16 #include <linux/clocksource.h>
17 #include <linux/cpu.h>
18 #include <linux/delay.h>
19 #include <linux/export.h>
20 #include <linux/init.h>
22 #include <linux/irq.h>
23 #include <linux/irqchip.h>
25 #include <linux/of_address.h>
26 #include <linux/of_irq.h>
27 #include <linux/of_platform.h>
28 #include <linux/opp.h>
29 #include <linux/phy.h>
30 #include <linux/reboot.h>
31 #include <linux/regmap.h>
32 #include <linux/micrel_phy.h>
33 #include <linux/mfd/syscon.h>
34 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
35 #include <asm/hardware/cache-l2x0.h>
36 #include <asm/mach/arch.h>
37 #include <asm/mach/map.h>
38 #include <asm/system_misc.h>
44 static u32 chip_revision;
46 int imx6q_revision(void)
51 static void __init imx6q_init_revision(void)
53 u32 rev = imx_anatop_get_digprog();
57 chip_revision = IMX_CHIP_REVISION_1_0;
60 chip_revision = IMX_CHIP_REVISION_1_1;
63 chip_revision = IMX_CHIP_REVISION_1_2;
66 chip_revision = IMX_CHIP_REVISION_UNKNOWN;
69 mxc_set_cpu_type(rev >> 16 & 0xff);
72 static void imx6q_restart(enum reboot_mode mode, const char *cmd)
74 struct device_node *np;
75 void __iomem *wdog_base;
77 np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt");
78 wdog_base = of_iomap(np, 0);
82 imx_src_prepare_restart();
85 writew_relaxed(1 << 2, wdog_base);
86 /* write twice to ensure the request will not get ignored */
87 writew_relaxed(1 << 2, wdog_base);
89 /* wait for reset to assert ... */
92 pr_err("Watchdog reset failed to assert reset\n");
94 /* delay to allow the serial port to show the message */
98 /* we'll take a jump through zero as a poor second */
102 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
103 static int ksz9021rn_phy_fixup(struct phy_device *phydev)
105 if (IS_BUILTIN(CONFIG_PHYLIB)) {
106 /* min rx data delay */
107 phy_write(phydev, 0x0b, 0x8105);
108 phy_write(phydev, 0x0c, 0x0000);
110 /* max rx/tx clock delay, min rx/tx control delay */
111 phy_write(phydev, 0x0b, 0x8104);
112 phy_write(phydev, 0x0c, 0xf0f0);
113 phy_write(phydev, 0x0b, 0x104);
119 static void mmd_write_reg(struct phy_device *dev, int device, int reg, int val)
121 phy_write(dev, 0x0d, device);
122 phy_write(dev, 0x0e, reg);
123 phy_write(dev, 0x0d, (1 << 14) | device);
124 phy_write(dev, 0x0e, val);
127 static int ksz9031rn_phy_fixup(struct phy_device *dev)
130 * min rx data delay, max rx/tx clock delay,
131 * min rx/tx control delay
133 mmd_write_reg(dev, 2, 4, 0);
134 mmd_write_reg(dev, 2, 5, 0);
135 mmd_write_reg(dev, 2, 8, 0x003ff);
140 static int ar8031_phy_fixup(struct phy_device *dev)
144 /* To enable AR8031 output a 125MHz clk from CLK_25M */
145 phy_write(dev, 0xd, 0x7);
146 phy_write(dev, 0xe, 0x8016);
147 phy_write(dev, 0xd, 0x4007);
149 val = phy_read(dev, 0xe);
152 phy_write(dev, 0xe, val);
154 /* introduce tx clock delay */
155 phy_write(dev, 0x1d, 0x5);
156 val = phy_read(dev, 0x1e);
158 phy_write(dev, 0x1e, val);
163 static void __init imx6q_sabrelite_cko1_setup(void)
165 struct clk *cko1_sel, *ahb, *cko1;
168 cko1_sel = clk_get_sys(NULL, "cko1_sel");
169 ahb = clk_get_sys(NULL, "ahb");
170 cko1 = clk_get_sys(NULL, "cko1");
171 if (IS_ERR(cko1_sel) || IS_ERR(ahb) || IS_ERR(cko1)) {
172 pr_err("cko1 setup failed!\n");
175 clk_set_parent(cko1_sel, ahb);
176 rate = clk_round_rate(cko1, 16000000);
177 clk_set_rate(cko1, rate);
179 if (!IS_ERR(cko1_sel))
187 #define PHY_ID_AR8031 0x004dd074
189 static void __init imx6q_enet_phy_init(void)
191 if (IS_BUILTIN(CONFIG_PHYLIB)) {
192 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
193 ksz9021rn_phy_fixup);
194 phy_register_fixup_for_uid(PHY_ID_KSZ9031, MICREL_PHY_ID_MASK,
195 ksz9031rn_phy_fixup);
196 phy_register_fixup_for_uid(PHY_ID_AR8031, 0xffffffff,
201 static void __init imx6q_sabresd_cko1_setup(void)
203 struct clk *cko1_sel, *pll4, *pll4_post, *cko1;
206 cko1_sel = clk_get_sys(NULL, "cko1_sel");
207 pll4 = clk_get_sys(NULL, "pll4_audio");
208 pll4_post = clk_get_sys(NULL, "pll4_post_div");
209 cko1 = clk_get_sys(NULL, "cko1");
210 if (IS_ERR(cko1_sel) || IS_ERR(pll4)
211 || IS_ERR(pll4_post) || IS_ERR(cko1)) {
212 pr_err("cko1 setup failed!\n");
216 * Setting pll4 at 768MHz (24MHz * 32)
217 * So its child clock can get 24MHz easily
219 clk_set_rate(pll4, 768000000);
221 clk_set_parent(cko1_sel, pll4_post);
222 rate = clk_round_rate(cko1, 24000000);
223 clk_set_rate(cko1, rate);
225 if (!IS_ERR(cko1_sel))
227 if (!IS_ERR(pll4_post))
235 static void __init imx6q_sabresd_init(void)
237 imx6q_sabresd_cko1_setup();
240 static void __init imx6q_1588_init(void)
244 gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
246 regmap_update_bits(gpr, IOMUXC_GPR1,
247 IMX6Q_GPR1_ENET_CLK_SEL_MASK,
248 IMX6Q_GPR1_ENET_CLK_SEL_ANATOP);
250 pr_err("failed to find fsl,imx6q-iomux-gpr regmap\n");
253 static void __init imx6q_usb_init(void)
255 imx_anatop_usb_chrg_detect_disable();
258 static void __init imx6q_init_machine(void)
260 if (of_machine_is_compatible("fsl,imx6q-sabrelite"))
261 imx6q_sabrelite_cko1_setup();
262 else if (of_machine_is_compatible("fsl,imx6q-sabresd") ||
263 of_machine_is_compatible("fsl,imx6dl-sabresd"))
264 imx6q_sabresd_init();
266 imx6q_enet_phy_init();
268 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
276 #define OCOTP_CFG3 0x440
277 #define OCOTP_CFG3_SPEED_SHIFT 16
278 #define OCOTP_CFG3_SPEED_1P2GHZ 0x3
280 static void __init imx6q_opp_check_1p2ghz(struct device *cpu_dev)
282 struct device_node *np;
286 np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-ocotp");
288 pr_warn("failed to find ocotp node\n");
292 base = of_iomap(np, 0);
294 pr_warn("failed to map ocotp\n");
298 val = readl_relaxed(base + OCOTP_CFG3);
299 val >>= OCOTP_CFG3_SPEED_SHIFT;
300 if ((val & 0x3) != OCOTP_CFG3_SPEED_1P2GHZ)
301 if (opp_disable(cpu_dev, 1200000000))
302 pr_warn("failed to disable 1.2 GHz OPP\n");
308 static void __init imx6q_opp_init(struct device *cpu_dev)
310 struct device_node *np;
312 np = of_find_node_by_path("/cpus/cpu@0");
314 pr_warn("failed to find cpu0 node\n");
318 cpu_dev->of_node = np;
319 if (of_init_opp_table(cpu_dev)) {
320 pr_warn("failed to init OPP table\n");
324 imx6q_opp_check_1p2ghz(cpu_dev);
330 static struct platform_device imx6q_cpufreq_pdev = {
331 .name = "imx6q-cpufreq",
334 static void __init imx6q_init_late(void)
337 * WAIT mode is broken on TO 1.0 and 1.1, so there is no point
338 * to run cpuidle on them.
340 if (imx6q_revision() > IMX_CHIP_REVISION_1_1)
341 imx6q_cpuidle_init();
343 if (IS_ENABLED(CONFIG_ARM_IMX6Q_CPUFREQ)) {
344 imx6q_opp_init(&imx6q_cpufreq_pdev.dev);
345 platform_device_register(&imx6q_cpufreq_pdev);
349 static void __init imx6q_map_io(void)
355 #ifdef CONFIG_CACHE_L2X0
356 static void __init imx6q_init_l2cache(void)
358 void __iomem *l2x0_base;
359 struct device_node *np;
362 np = of_find_compatible_node(NULL, NULL, "arm,pl310-cache");
366 l2x0_base = of_iomap(np, 0);
372 /* Configure the L2 PREFETCH and POWER registers */
373 val = readl_relaxed(l2x0_base + L2X0_PREFETCH_CTRL);
375 writel_relaxed(val, l2x0_base + L2X0_PREFETCH_CTRL);
376 val = L2X0_DYNAMIC_CLK_GATING_EN | L2X0_STNDBY_MODE_EN;
377 writel_relaxed(val, l2x0_base + L2X0_POWER_CTRL);
383 l2x0_of_init(0, ~0UL);
386 static inline void imx6q_init_l2cache(void) {}
389 static void __init imx6q_init_irq(void)
391 imx6q_init_revision();
392 imx6q_init_l2cache();
398 static void __init imx6q_timer_init(void)
401 clocksource_of_init();
402 imx_print_silicon_rev(cpu_is_imx6dl() ? "i.MX6DL" : "i.MX6Q",
406 static const char *imx6q_dt_compat[] __initdata = {
412 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad/DualLite (Device Tree)")
413 .smp = smp_ops(imx_smp_ops),
414 .map_io = imx6q_map_io,
415 .init_irq = imx6q_init_irq,
416 .init_time = imx6q_timer_init,
417 .init_machine = imx6q_init_machine,
418 .init_late = imx6q_init_late,
419 .dt_compat = imx6q_dt_compat,
420 .restart = imx6q_restart,